Abstract
A number of attempts have been made in an effort to combine the advantages of line-of-sight and diffuse configurations for indoor optical wireless communications via sophisticated combinations of elements that are characteristic for these architectures. A different approach has been followed in the present investigation, namely, developing a transceiver capable of operating in both configurations. It is proposed that the transceiver design be based on the utilization of two-dimensional arrays of infrared light-emitting devices and photodetectors. Basic design parameters of transceiver optics are derived from considerations about link blockage and system compliance with the unique features of line-of-sight and diffuse methods of transmission.
Highlights
It has been more than two decades since Gfeller and Bapst [1] suggested that diffusely scattered infrared light could be utilized as a medium for wireless communications indoors
The basic idea that underlies the present investigation is to bring together the two most promising configurations for optical wireless networks indoors, namely, cellular line-ofsight and multispot diffusing (MSD) configurations. This is attempted through developing a system that would be capable of operating in both configurations rather than a sophisticated combination of the architectures themselves
As a first step towards achieving this goal, it is proposed that transceiver design is based on utilization of two-dimensional arrays of infrared light emitting devices and photodetectors
Summary
It has been more than two decades since Gfeller and Bapst [1] suggested that diffusely scattered infrared light could be utilized as a medium for wireless communications indoors. Transmitter projects the light power in form of multiple narrow beams of equal intensity, over a regular grid of small areas (spots) on a diffusely reflecting surface such as a ceiling. This way, the signal power is uniformly distributed within the office and the link quality does not depend on the receiver-transmitter distance. The system provides only the active users with signal and saves some power by not distributing optical signal where it is not needed With such a transmitter design, independent communication channels (different information streams are launched through different diffusing spots) are feasible, providing a means for spatial diversity. The aim of this paper is to make the first step towards the optical design of such a universal transceiver
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